JPS646523B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a superconducting coil device,
In particular, it relates to a winding frame around which a superconducting winding is wound.

[Prior art]

A conventional superconducting coil device has a superconducting winding (coil) 1, as shown schematically in the plane in FIG.
For example, as in this embodiment, it is configured by being wound around the outer periphery of an annular winding frame 2.

The superconductor is wound directly onto the outer periphery of the winding frame 2 under tension to form the superconducting winding 1. However, if the superconducting winding is loose, the current value at which it can be operated as a superconducting coil device will decrease. can only take a value significantly below the short sample critical current value of the superconducting conductor, so the superconducting winding must be wound with sufficient tension in order to fully exhibit the superconducting properties of the superconducting conductor. It is important that there is no looseness.

However, the superconducting conductor is wound on the winding frame sequentially from the inner diameter side of the winding, and the outer diameter side conductor tends to compress the already wound superconducting conductor on the inner diameter side toward the center. , acts to loosen the tension of the conductor on the inner diameter side. Therefore, when the winding is completed, the conductor on the inner diameter side has a residual tension that is lower than the tension when it was initially wound. Normally, the innermost diameter part of a superconducting coil has the highest magnetic field and is therefore the most difficult part for exhibiting superconducting properties.However, conversely, the winding in this part is most likely to be loose, which is a weak point in demonstrating superconducting properties. It was hot.

[Summary of the invention]

This invention was made in view of the above-mentioned drawbacks of conventional superconducting coil devices, and an object of the present invention is to provide a superconducting coil device that has less loosening of superconducting windings and has higher superconducting properties than the conventional ones. For this purpose, the superconducting coil device according to the present invention has a first winding frame formed by dividing a cylindrical member into a plurality of parts in the circumferential direction, and a first winding frame whose outer diameter is larger than the inner diameter of the cylindrical member. The second winding frame is installed inside the first winding frame, and when the second winding frame is inserted inside the first winding frame, the first winding frame is expanded outward in the radial direction, and the superconducting It acts to add tension to the windings and has the effect of improving the superconducting properties of the superconducting coil device.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. As shown in FIG. 2, in the superconducting coil device of the present invention, the superconducting winding 1 is wound around the outer periphery of the first winding frame 3 and held therein. As shown in the figure, the first winding frame 3 is formed by dividing a cylindrical member into a plurality of parts in the circumferential direction, that is, in the winding direction. In FIG. 2, it is divided into eight equal parts, but the number of divisions may of course be arbitrary. Since the first winding frame 3 is divided, a holding frame 5 is required to unite it, and in the illustrated example, it is placed outside the holding frame 5 so that it is held integrally. If there is a device (not shown) that directly connects each divided body of the first winding frame 3, the holding frame 5 is not necessary.

As shown in FIG. 2, this method is the same as the prior art in that the superconducting conductor is directly wound around the outer periphery of the first winding frame 3 while applying tension. The feature of this invention is that the winding frame is
It is composed of a winding frame 3 and a second winding frame 4 (Fig. 3), and after winding the superconducting winding 1 as shown in Fig. 2, the holding frame 5 is removed and the holding frame 5 is Instead, as shown in FIG. 3, the inner diameter of the first winding frame 3 (inner diameter of the cylindrical member) when the dividing surfaces are joined
Integrated second winding frame 4 with a smaller and larger outer diameter
is inserted inside the first winding frame 3. In order to insert the second winding frame 4 inside the first winding frame 3, the outer diameter of the second winding frame 4 is temporarily reduced by, for example, cooling the second winding frame 4 below room temperature. Alternatively, a shrink fitting method may be used in which the superconducting winding 1 and the first winding frame 3 are heated to temporarily increase the inner diameter of the first winding frame. Or the second volume frame 4
This may also be done by press-fitting the first winding frame 3 into the first winding frame 3.
By inserting the second winding frame 4 into the first winding frame 3 in this way, the outer diameter of the first winding frame 3 becomes larger than the state shown in FIG. 2 when the superconducting winding 1 is initially wound. . That is, the superconducting winding is stretched from the inner diameter side to the outer diameter side, and tension is applied to the superconducting winding. Furthermore, the effect of adding tension is most significant at the innermost diameter portion, which was most likely to loosen in the prior art. That is, the operating current value can be increased, and the superconducting characteristics of the superconducting coil device can be significantly improved.

In the above embodiment, the winding frame is explained using an annular winding frame, but the winding frame may be an oval ring shape or an elliptical ring body, or may be a closed curve shape in which a plurality of circular arcs are smoothly connected with a straight line. This can be expected to have the following effects. Furthermore, although non-magnetic steel is usually used as the material for the first winding frame, any material may be used as long as it can be used at extremely low temperatures, and of course it may be an electrically insulating material. Regarding the second volume frame, the first
It is exactly the same as the winding frame.

〔Effect of the invention〕

According to the invention, the winding frame includes a first winding frame formed by dividing a cylindrical member into a plurality of pieces in the circumferential direction; Second
By inserting the second winding frame inside the first winding frame, the first winding frame is pushed out toward the superconducting winding, so that tension can be applied to the superconducting winding. A superconducting coil device with no loose superconducting windings can be obtained. In other words, it is possible to obtain a superconducting coil device having high superconducting properties and a high operating current.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing a conventional superconducting coil device, Figs. 2 and 3 show an embodiment of the superconducting coil device according to the present invention, and Fig. 2 is a plan view showing the state before the second winding frame is attached. 3 are plan views showing the completed superconducting coil device. 1... Superconducting winding, 2... Winding frame, 3... First winding frame, 4... Second winding frame, 5... Holding frame. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In a superconducting coil device formed by winding a superconducting winding on the outer periphery of a winding frame, the winding frame includes a first winding frame formed by dividing a cylindrical member into a plurality of pieces in the circumferential direction, and a first winding frame formed by dividing a cylindrical member into a plurality of pieces in the circumferential direction, a second winding frame that is larger than the inner diameter of the member and is inserted inside the first winding frame to push the first winding frame around which the superconducting winding is wound toward the superconducting winding side; A superconducting coil device characterized by: